I just picked up a Mastercool 71475 Hydraulic operated flaring kit. This sweet unit makes all common flares, 45 degree single and double (SAE), 37 degree single and double (AN and JIC), GM fuel lines (Saginaw flare), Ford quick connect lines, and metric bubble flares. Every flare I have done with it turns out perfectly, looks like the factory made it! Instead of dicking with those bar style crap ones that I never had great luck with (always off center, gotta do it off the vehicle, etc) this tool allows for you to make any flare you want right on the vehicle.
It uses a small hydraulic ram to form the flare. It is incredibly fast and makes perfect flares. I will never use the bar style ones again, I am giving mine to my dad to let him berkeley with it.
At over $300 for the master kit, it is a bit pricey, but one brake job on a car would pay for it, and it will save countless hours of frustration and aggravation.
